I can't see any way you're going to get away with not having bags on the floor - It's just the nature of the layout of that boat. If you can get past that, wow, you can really sack that thing out! Just add as much weight as you can down the side and especially in the back corner. Don't neglect the front though as too much weight aft will shorten the wave.

Yeah I have no problem with bags in the floor. I had an 1100 on the left side and one 350 in each back corner with full ballast. I think I messed up weighting the other side. Also 8 people on the left side from front to back